Disazo dyes



Patented Oct. 30, 1923. i

U'NlTED STATES ASA WILLARD JOYCE. OF NEWARK, NEW JERSEY, ASSIGNOR TO THE CHEMICAL FOUNDATION, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION 01 DELA- WARE.

DISA ZO DYES.

K0 Drawing.

To all whom it may roncerw Be it known that I, Asa WILLARD .lorcs, acitizen of the United States, and a resident of the city of Newark and State of New Jersey, have invented an Improvement in Disazo Dyes, of which the following is a specification;

My invention relates toithe production of disazo dyestuffs and has an object a ready and practical mode suitable for the manufacture of such dyestuffs.

It has been ascertained by me that disazo dyes may be produced through the interaction of tetrazo derivatives of diamino; diaryl ketoncs having the general formula wherein may indicate hydrogen and a halogen, and R may indicate an aryl rouping, with naphthol derivatives of the ollowing general constitution i I on r' ifl z wherein X and Y may signify hydrogen and a sulphonic acid grou and Z may signify hydrogen, an hydroxy group, and chlorine, said dyestuffs ranging 1n shade from yel- Iowish-rek to violet and readily producing dyeings upon wool and silk which exhibit an excellent fastness to light, to; washing, and to milling, are" generally soluble in water, soluble in concentrated sulphuric acid, and are further characterized b conversion upon reduction, preferably wlth tin and hydrochloric acid, into diamlno dia 1' ketones and an amino derivative of a nap thol Or a naphthol sulfonic acid.

For the preparation \of these coloring matters I may employ diamino diaryl ketones which are obtainable fromthe corresponding diaryL methanes by a process described in the. German Patent #289,108,

which process consists", with'particular reference to the preparation of diamino di- Iphenyl ketone, in heating diamino di 'henyl methane under a reflux for an exten ed period of time with a. mixture of crystallized sodium sulphide. and sulphur.

Adiamino diaryl ketone obtained in accordance with the above outlined method is dissolved in water-containing hydrochloric acid and diazotized by adding sodium mi:

Application filed June 115,

1922. Serial No. 568,634.

trite thereto, the diazotized solution is then Example I.

21.2 parts of p. diamino diphenyl ketone are diazotize with 50 parts of concentrated hydrochloric acid and 14 arts of sodium nitrite at 0 to 5 C. T e diazo solution is added to a solution of 2 parts of beta-naphthol, dissolved in afs'o ution containing 23 parts of caustic soda lye (40 Be.) and 10 parts of sodium carbonate.

The dyestuit forms immediately and separates as a brightred precipitate. This pre cipitate is insoluble in water which renders it of value as a pigment.

In the form of its alkaline earth lake, for example with salts of barium and calcium, the lakes produced are a. bright yellowishred shade. -Upon reduction under the in fiuence of, for example, tin and hydrochloric acid, the dyestuft" yields pp diamino diphenyl ketone and 1.2-amino naphthol,

EwampZe II.

brilliant red preci itate. After stirring for a periodof time, t e color mixture is heated to 80 and-saturated with salt (NaCl).

In a drystate the dyestud is a red powder soluble in water with a bright red color which is not altered in shade by the addition of acetic acid or sodium corbonate, and

dissolves in concentrated sulphuric acid giving a violet colored solution. It d es Upon reduction under the influence of, for example, tin and hydrochloric acid, the dyestuff yields p.p diamino diphenyl ketone and l-amino 2 naphthol 3-(3-disulphonic acid.

Emample III.

21.2 parts of p p diamino diphenyl ketone are diazotizedas described in Example I, and allowed to run into a cold solution containing (55 parts of 1.8-dioxynaphthalene-3.6-disulphonic acid and 130 parts of sodium carbonate. After stirring for a. period of time the color mixture is heated to 80 C. and saturated with common salt, whereupon the dye is precipitated as the sodium salt.

In a dry state it constitutes a dark reddish-brown powder, readily soluble in water, soluble in concentrated sulphuric acid with a blue coloration, and on mild reduction with tin and hydrochloric acid gives rise to p.p 1 diamino diphenyl ketone and Q-amino- 1.8-dioxynaphthalene-3.6-disulphonic acid.

When wool is dyed in the usual manner there is produced a bright bluish-red fast to light, to washing and to' milling. Upon cotton a reddish-violet shade is obtained which is relatively fast to light, to acid and to washing.

The dyestuffs which ma coupling of diamino diaryl ketones and their derivatives with naphthols, such as betana'phthol and naphthol sulphonic acids, such as R-acid (Q-naphthol 3-6-disulphonic acid) may be converted into lakes which are suitable for the preparation of red pigment colors. These coloring matters in a dry state range from a bright red to a dark red which dissolve in concentrated sulphuric acid with the formation of reddish-blue to greenish-blue solutions.

The diamino diaryl ketones which may be employed, it will be evident, maybe either be. obtained by a.

simple or mixed. Furthermore, it is to be understood that the invention is not limited to the. specific constituents, amounts thereof, nor reaction condition set forth in the above examples, 'but that the same may be modified and Varied within the scope of the sub-joining claims.

I claim:

1. As a new article of manufacturethe coloring matters obtained by coupling one molecule of a diamino diaryl ketone of the general formula NI2 R(0R ;H2

in which X may signify hydrogen and chlorine, and K may signify an aryl grouping, with two molecules of a naphthol derivative correspondingto the general formula wherein X andY may signify hydrogen :"nd a sulphonic acid gronpand Z may signify hydrogen, an hydroxyl group and chlorine.

2. As a new article of n|anufa .-tnre. the coloring matter which is produced by coupling p.p diamino diphenyl kctonc with E2.naphihol 3.6.disulphonic acid, said coloring matter in a dry state being a red powder. soluble in concentrated sulphuric acid. soluble in water, dyes silk and wool bright red shades, fast to light, to acids. to washing and to milling, and when reduced with tin and hydrochloric acid forms p.p"dian\ino diphenyl ketone and 1.amino 52.naphthol, 3.6-disulphonic acid.

In testimony whereof. I have signed my name to this specification this 14 day of June, 1922.

A. WILLARD JOYCE. 

